A Japanese cat island also populated by the descendants of a band of banished samurai.

This series of rope-style bridges brings visitors into a jungle layer that is usually reserved for birds and monkeys.

This abandoned Croatian stronghold never saw a great deal of conflict but it is still a beloved relic nonetheless.

Portraits of musicians line Oude Binnenweg, the jazziest street in the city.

This century-old street sign is a forgotten remnant of the old city.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

The birthplace of most all of Europe's space missions is here on the Dutch coast.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

Peek through a transparent pyramid and drink in the mountain made of books.

FDR's Art Deco hospital tower was hopelessly inefficient.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

On special occasions, one of the world's tallest artificial waterfalls gushes down the side of this Chinese skyscraper.

Inside this museum is an ongoing excavation of an ancient shipwreck.

An abandoned film set location for a remote spaceport in a galaxy far, far away hides in the Tunisian desert.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

This research hub in the Amazon Rainforest is perched amid one of the world's most biologically diverse landscapes.

Home to two notable early-20th-century Black educators, Lucy Slowe and Mary Burrill.

This unassuming passageway played a key role in one of the most important events in U.S. history.

Where the U.S. government kept its actual treasure, before Fort Knox.

There's a crumbling old mansion inside the Smithsonian National Zoo.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.